Magnets | Science Museum Group Collection

Du Bois-Reymond's compensating magnet. It allowed the one operating a galvanometer to fine-tune its sensitivity by repositioning a permanent magnet as necessary in order to compensate wholly or partially for the Earth's magnetic pull on the galvanometer needle. The wooden guide was affixed to the center of the galvanometer and could rotate freely; the magnet, in a brass mount, could be precisely positioned at any distance from the center. A pulley and string arrangement allowed the operator to adjust the magnet on the fly while seated a distance away at the reading telescope.

Du Bois-Reymond's galvanometer-compensating magnet

1876

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Short steel bar magnet

Collection of six ball-ended magnets

Magnets rotating round a current

Pair of bar magnets

Two ferrite loudspeaker ring magnets

Pair of collimator magnets in wooden carier

Bar magnets

Magnetic disc record type 3011 made by W. Assman at Bad Homburg

Magnet, cuboid block, magnets on base

Magnet in case

Magnet, metal, U-shaped, European, 19th century

Pair of bar magnets

Pair of bar magnets

Portable pivoted horse-shoe magnet type galvanometer

Pair of magnetic floater magnets

Magnetical magazine, twelve magnets in case

Short steel bar magnet

Short steel bar magnet

Horseshoe magnet 170mm long

Horseshoe magnet 210mm long

Large magnet

Magnet to show construction

Selection of permanent magnets

Magnet rotating on its own axis

Magnets with quote by Stephen Hawking

Four pairs of small steel magnets

Set of 'Artificial' Magnets, c. 1762

Pair of collimator magnets, ex Kew Observatory

Eclipse laboratory set of permanent magnets

Two pairs of bar magnets with keepers in fitted box

2 steel horseshoe magnets

Firle eye magnet in case

Two bar magnets with pair of keeps in wooden box

Motor car magneto

Professor Daniell's lodestone used by Faraday in 1831

C.A.V., HN4, 4 cylinder magnet

1931 design 'assembled' cobalt steel permanent magnet

1931 design 'enclosed pot' cobalt steel permanent magnet

1931 design 'M' shape cobalt steel permanent magnet

1931 design: 'four claw' cobalt steel permanent magnet

Magnetic disc record type Universa 50

Magnet, in wooden case used by linemen for resetting early telegraph instruments

Three bar magnets

Du Bois-Reymond's galvanometer-compensating magnet

Sherardised magnet

Magnetic balance

Four coil resistive magnet (0.1 Tesla) used in MRI